Verwenden Sie mehrere DataSource mit Spring Boot und RoutingDataSource
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Manchmal sollen Sie eine Web-Applikation verbindend mit vielen unterchiedlichen Database erstellen. Und Sie können es im Spring Boot einfach machen.
Spring bietet Sie die Klasse AbstractRoutingDataSource, Sie sollen eine Klasse schreiben, die aus der Klasse ausgeweitert wird. Routing Datasource enthaltet ein Map der echten Datasource.
Spring bietet Sie die Klasse AbstractRoutingDataSource, Sie sollen eine Klasse schreiben, die aus der Klasse ausgeweitert wird. Routing Datasource enthaltet ein Map der echten Datasource.

Note: Routing Datasource is also a Datasource but it is a special one.
Und DataSource Interceptor entscheidet, welche entspechende DataSource der Anforderung aus dem Benutzer benutzt werden.

Im Dokument bezeichne ich eine Website benutzend 2 datasource. Jede datasource verbindet mit einer verschiedenen Database. Eine Database speichert die Information für das System Publisher und eine Database speichert die Information für das System Advertiser

In einiger Situation können Sie eine MultispracheWebsite machen. Sie können viele Database erstellen. Jede Database speichert den Artikel einer bestimmten Sprache

Wenn Ihre Applikation in einem anderen Fall viel DataSource brauchen und jede Funktion (jede Seite) kann mit vielen DataSource gleichzeitig arbeiten, brauchen Sie die folgenden Anleitungen lernen:
Ich werde 2 Database erstellen. Eine Database ist für das System PUBLISHER und eine Database für das System ADVERTISER . 2 Database können die gleichen Typ sein. Sie können Oracle, MySQL oder SQL Server, ... benutzen
Database1:
Das DB System vom PUBLISHER hat eine Tabelle Publishers.
Database1 - (MySQL, SQL Server, PostGres)
-- =========================================== -- DATABASE FOR PUBLISHER SYSTEM -- =========================================== create table PUBLISHERS ( ID Bigint, NAME VARCHAR(255), Primary key (ID) ); insert into publishers (ID, NAME) values (1, 'publisher 1'); insert into publishers (ID, NAME) values (2, 'publisher 2');
Database1 - (ORACLE)
-- =========================================== -- DATABASE FOR PUBLISHER SYSTEM -- =========================================== create table PUBLISHERS ( ID NUMBER(19), NAME VARCHAR(255), Primary key (ID) ); insert into publishers (ID, NAME) values (1, 'publisher 1'); insert into publishers (ID, NAME) values (2, 'publisher 2'); Commit;
Database 2:
Das DB System vom ADVERTISER hat eine Tabelle Advertisers.
Database2 (MySQL, SQL Server, PostGres)
-- =========================================== -- DATABASE FOR ADVERTISER SYSTEM -- =========================================== create table ADVERTISERS ( ID Bigint, NAME VARCHAR(255), Primary key (ID) ); insert into advertisers (ID, NAME) values (1, 'Advertiser 1'); insert into advertisers (ID, NAME) values (2, 'Advertiser 2');
Database2 - (ORACLE)
-- =========================================== -- DATABASE FOR ADVERTISER SYSTEM -- =========================================== create table ADVERTISERS ( ID NUMBER(19), NAME VARCHAR(255), Primary key (ID) ); insert into advertisers (ID, NAME) values (1, 'Advertiser 1'); insert into advertisers (ID, NAME) values (2, 'Advertiser 2'); Commit;

pom.xml
<?xml version="1.0" encoding="UTF-8"?> <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"> <modelVersion>4.0.0</modelVersion> <groupId>org.o7planning</groupId> <artifactId>SpringBootRoutingDS</artifactId> <version>0.0.1-SNAPSHOT</version> <packaging>jar</packaging> <name>SpringBootRoutingDS</name> <description>Spring Boot + Multi DataSource + Routing DataSource</description> <parent> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-parent</artifactId> <version>2.0.0.RELEASE</version> <relativePath/> <!-- lookup parent from repository --> </parent> <properties> <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding> <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding> <java.version>1.8</java.version> </properties> <dependencies> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-jdbc</artifactId> </dependency> <!-- For Thymeleaf VIEW. Remove it if using Jsp VIEW --> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-thymeleaf</artifactId> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId> </dependency> <dependency> <groupId>mysql</groupId> <artifactId>mysql-connector-java</artifactId> <scope>runtime</scope> </dependency> <dependency> <groupId>org.postgresql</groupId> <artifactId>postgresql</artifactId> <scope>runtime</scope> </dependency> <!-- SQL Server - Mssql-Jdbc driver --> <dependency> <groupId>com.microsoft.sqlserver</groupId> <artifactId>mssql-jdbc</artifactId> <scope>runtime</scope> </dependency> <!-- SQL Server - JTDS driver --> <dependency> <groupId>net.sourceforge.jtds</groupId> <artifactId>jtds</artifactId> <scope>runtime</scope> </dependency> <dependency> <groupId>com.oracle</groupId> <artifactId>ojdbc6</artifactId> <version>11.2.0.3</version> </dependency> <!-- For JSP VIEW (Need REMOVE spring-boot-starter-thymeleaf) --> <dependency> <groupId>org.apache.tomcat.embed</groupId> <artifactId>tomcat-embed-jasper</artifactId> </dependency> <!-- For JSP VIEW (Need REMOVE spring-boot-starter-thymeleaf) --> <dependency> <groupId>javax.servlet</groupId> <artifactId>jstl</artifactId> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-test</artifactId> <scope>test</scope> </dependency> </dependencies> <repositories> <!-- Repository for ORACLE JDBC Driver --> <repository> <id>codelds</id> <url>https://code.lds.org/nexus/content/groups/main-repo</url> </repository> </repositories> <build> <plugins> <plugin> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-maven-plugin</artifactId> </plugin> </plugins> </build> </project>
Die Information von Database wird in die File datasource-cfg.properties konfiguriert

datasource-cfg.properties (MySQL + MySQL)
# DataSource (PUBLISHER System). spring.datasource.driver-class-name.1=com.mysql.jdbc.Driver spring.datasource.url.1=jdbc:mysql://localhost:3306/publisher spring.datasource.username.1=root spring.datasource.password.1=12345 # DataSource (ADVERTISER System). spring.datasource.driver-class-name.2=com.mysql.jdbc.Driver spring.datasource.url.2=jdbc:mysql://localhost:3306/advertiser spring.datasource.username.2=root spring.datasource.password.2=12345
datasource-cfg.properties (SQL Server + SQL Server) (JTDS Driver)
# DataSource (PUBLISHER System). spring.datasource.driver-class-name.1=net.sourceforge.jtds.jdbc.Driver spring.datasource.url.1=jdbc:jtds:sqlserver://localhost:1433/publisher;instance=SQLEXPRESS spring.datasource.username.1=sa spring.datasource.password.1=12345 # DataSource (ADVERTISER System). spring.datasource.driver-class-name.2=net.sourceforge.jtds.jdbc.Driver spring.datasource.url.2=jdbc:jtds:sqlserver://localhost:1433/advertiser;instance=SQLEXPRESS spring.datasource.username.2=sa spring.datasource.password.2=12345
datasource-cfg.properties (SQL Server + SQL Server) (Mssql-Jdbc Driver)
# DataSource (PUBLISHER System). spring.datasource.driver-class-name.1=com.microsoft.sqlserver.jdbc.SQLServerDriver spring.datasource.url.1=jdbc:sqlserver://tran-vmware-pc\\SQLEXPRESS:1433;databaseName=publisher spring.datasource.username.1=sa spring.datasource.password.1=12345 # DataSource (ADVERTISER System). spring.datasource.driver-class-name.2=com.microsoft.sqlserver.jdbc.SQLServerDriver spring.datasource.url.2=jdbc:sqlserver://tran-vmware-pc\\SQLEXPRESS:1433;databaseName=advertiser spring.datasource.username.2=sa spring.datasource.password.2=12345
datasource-cfg.properties (ORACLE + ORACLE)
# DataSource (PUBLISHER System). spring.datasource.driver-class-name.1=oracle.jdbc.driver.OracleDriver spring.datasource.url.1=jdbc:oracle:thin:@localhost:1521:db12c spring.datasource.username.1=publisher spring.datasource.password.1=12345 # DataSource (ADVERTISER System). spring.datasource.driver-class-name.2=oracle.jdbc.driver.OracleDriver spring.datasource.url.2=jdbc:oracle:thin:@localhost:1521:db12c spring.datasource.username.2=advertiser spring.datasource.password.2=12345
datasource-cfg.properties (PostGres + PostGres)
# DataSource (PUBLISHER System). spring.datasource.driver-class-name.1=org.postgresql.Driver spring.datasource.url.1=jdbc:postgresql://tran-vmware-pc:5432/publisher spring.datasource.username.1=postgres spring.datasource.password.1=12345 # DataSource (ADVERTISER System). spring.datasource.driver-class-name.2=org.postgresql.Driver spring.datasource.url.2=jdbc:postgresql://tran-vmware-pc:5432/advertiser spring.datasource.username.2=postgres spring.datasource.password.2=12345

Nach dem Standard wird Spring Boot eine DataSource konfigurieren,deshalb sollen Sie es deaktivieren damit es Ihre DataSource konfigurieren kann. Die automatischen Konfigurationen schließt ein:
- DataSourceAutoConfiguration
- DataSourceTransactionManagerAutoConfiguration
SpringBootRoutingDsApplication.java
package org.o7planning.sbroutingds; import java.sql.SQLException; import javax.sql.DataSource; import org.o7planning.sbroutingds.routing.MyRoutingDataSource; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.boot.SpringApplication; import org.springframework.boot.autoconfigure.EnableAutoConfiguration; import org.springframework.boot.autoconfigure.SpringBootApplication; import org.springframework.boot.autoconfigure.jdbc.DataSourceAutoConfiguration; import org.springframework.boot.autoconfigure.jdbc.DataSourceTransactionManagerAutoConfiguration; import org.springframework.context.annotation.Bean; import org.springframework.context.annotation.PropertySource; import org.springframework.context.annotation.PropertySources; import org.springframework.core.env.Environment; import org.springframework.jdbc.datasource.DataSourceTransactionManager; import org.springframework.jdbc.datasource.DriverManagerDataSource; @SpringBootApplication // Disable Auto Config DataSource & DataSourceTransactionManager @EnableAutoConfiguration(exclude = { // DataSourceAutoConfiguration.class, // DataSourceTransactionManagerAutoConfiguration.class }) // Load to Environment // (@see resources/datasource-cfg.properties). @PropertySources({ @PropertySource("classpath:datasource-cfg.properties") }) public class SpringBootRoutingDsApplication { // Stores all the properties loaded by the @PropertySource @Autowired private Environment env; public static void main(String[] args) { SpringApplication.run(SpringBootRoutingDsApplication.class, args); } // Returns Routing DataSource (MyRoutingDataSource) @Autowired @Bean(name = "dataSource") public DataSource getDataSource(DataSource dataSource1, DataSource dataSource2) { System.out.println("## Create DataSource from dataSource1 & dataSource2"); MyRoutingDataSource dataSource = new MyRoutingDataSource(); dataSource.initDataSources(dataSource1, dataSource2); return dataSource; } @Bean(name = "dataSource1") public DataSource getDataSource1() throws SQLException { DriverManagerDataSource dataSource = new DriverManagerDataSource(); // See: datasouce-cfg.properties dataSource.setDriverClassName(env.getProperty("spring.datasource.driver-class-name.1")); dataSource.setUrl(env.getProperty("spring.datasource.url.1")); dataSource.setUsername(env.getProperty("spring.datasource.username.1")); dataSource.setPassword(env.getProperty("spring.datasource.password.1")); System.out.println("## DataSource1: " + dataSource); return dataSource; } @Bean(name = "dataSource2") public DataSource getDataSource2() throws SQLException { DriverManagerDataSource dataSource = new DriverManagerDataSource(); // See: datasouce-cfg.properties dataSource.setDriverClassName(env.getProperty("spring.datasource.driver-class-name.2")); dataSource.setUrl(env.getProperty("spring.datasource.url.2")); dataSource.setUsername(env.getProperty("spring.datasource.username.2")); dataSource.setPassword(env.getProperty("spring.datasource.password.2")); System.out.println("## DataSource2: " + dataSource); return dataSource; } @Autowired @Bean(name = "transactionManager") public DataSourceTransactionManager getTransactionManager(DataSource dataSource) { DataSourceTransactionManager txManager = new DataSourceTransactionManager(); txManager.setDataSource(dataSource); return txManager; } }
MyRoutingDataSource íst eine DataSource, die ein Map zwischen die Schlüssel und die echtlichen Datasource enthaltet.

MyRoutingDataSource.java
package org.o7planning.sbroutingds.routing; import java.util.HashMap; import java.util.Map; import javax.servlet.http.HttpServletRequest; import javax.sql.DataSource; import org.springframework.jdbc.datasource.lookup.AbstractRoutingDataSource; import org.springframework.web.context.request.RequestContextHolder; import org.springframework.web.context.request.ServletRequestAttributes; // This is a DataSource. public class MyRoutingDataSource extends AbstractRoutingDataSource { @Override protected Object determineCurrentLookupKey() { HttpServletRequest request = ((ServletRequestAttributes) RequestContextHolder.getRequestAttributes()) .getRequest(); // See more: DataSourceInterceptor String keyDS = (String) request.getAttribute("keyDS"); System.out.println("KeyDS=" + keyDS); if (keyDS == null) { keyDS = "PUBLISHER_DS"; } return keyDS; } public void initDataSources(DataSource dataSource1, DataSource dataSource2) { Map<Object, Object> dsMap = new HashMap<Object, Object>(); dsMap.put("PUBLISHER_DS", dataSource1); dsMap.put("ADVERTISER_DS", dataSource2); this.setTargetDataSources(dsMap); } }

DataSourceInterceptor wird URL vom Request analysieren und entscheidet, welche Datasource verwendet wird.

DataSourceIntercetor.java
package org.o7planning.sbroutingds.interceptor; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import org.springframework.web.servlet.handler.HandlerInterceptorAdapter; public class DataSourceIntercetor extends HandlerInterceptorAdapter { // Request: // /publisher/list // /advertiser/list @Override public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception { String contextPath = request.getServletContext().getContextPath(); // /SomeContextPath/publisher String prefixPublisher = contextPath + "/publisher"; // /SomeContextPath/advertiser String prefixAdvertiser = contextPath + "/advertiser"; // /SomeContextPath/publisher/dashboard // /SomeContextPath/advertiser/dashboard String uri = request.getRequestURI(); System.out.println("URI:"+ uri); if(uri.startsWith(prefixPublisher)) { request.setAttribute("keyDS", "PUBLISHER_DS"); } else if(uri.startsWith(prefixAdvertiser)) { request.setAttribute("keyDS", "ADVERTISER_DS"); } return true; } }
Im WebMvcConfig sollen Sie DataSourceInterceptor registrieren.
WebMvcConfig.java
package org.o7planning.sbroutingds.config; import org.o7planning.sbroutingds.interceptor.DataSourceIntercetor; import org.springframework.context.annotation.Configuration; import org.springframework.web.servlet.config.annotation.InterceptorRegistry; import org.springframework.web.servlet.config.annotation.WebMvcConfigurer; @Configuration public class WebMvcConfig implements WebMvcConfigurer { @Override public void addInterceptors(InterceptorRegistry registry) { registry.addInterceptor(new DataSourceIntercetor())// .addPathPatterns("/publisher/*", "/advertiser/*"); } }

DataDAO ist eine Utility Klasse, die die Daten aus der Database abfragen
DataDAO.java
package org.o7planning.sbroutingds.dao; import java.util.List; import javax.sql.DataSource; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.jdbc.core.support.JdbcDaoSupport; import org.springframework.stereotype.Repository; import org.springframework.transaction.annotation.Transactional; @Repository @Transactional public class DataDAO extends JdbcDaoSupport { @Autowired public DataDAO(DataSource dataSource) { this.setDataSource(dataSource); } public List<String> queryPublishers() { String sql = "Select name from Publishers"; List<String> list = this.getJdbcTemplate().queryForList(sql, String.class); return list; } public List<String> queryAdvertisers() { String sql = "Select name from Advertisers"; List<String> list = this.getJdbcTemplate().queryForList(sql, String.class); return list; } }
MainController.java
package org.o7planning.sbroutingds.controller; import java.sql.SQLException; import java.util.List; import org.o7planning.sbroutingds.dao.DataDAO; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.stereotype.Controller; import org.springframework.ui.Model; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.RequestMethod; @Controller public class MainController { @Autowired private DataDAO dataDAO; @RequestMapping(value = { "/" }, method = RequestMethod.GET) public String home(Model model) throws SQLException { return "home"; } @RequestMapping(value = { "/advertiser/list" }, method = RequestMethod.GET) public String advertiser(Model model) throws SQLException { List<String> list = dataDAO.queryAdvertisers(); model.addAttribute("advertisers", list); return "advertiser"; } @RequestMapping(value = { "/publisher/list" }, method = RequestMethod.GET) public String publisher(Model model) throws SQLException { List<String> list = dataDAO.queryPublishers(); model.addAttribute("publishers", list); return "publisher"; } }

home.html
<!DOCTYPE html> <html xmlns:th="http://www.thymeleaf.org"> <head> <meta charset="UTF-8"/> <title>Home</title> </head> <body> <h2>Multi DataSource with RoutingDataSource</h2> <h3>/publisher/* ==> Using Publisher-DB</h3> <ul> <li><a th:href="@{/publisher/list}">Show Publisher List</a></li> </ul> <h3>/advertiser/* ==> Using Advertiser-DB</h3> <ul> <li> <a th:href="@{/advertiser/list}">Show Advertiser Lists</a> </li> </ul> </body> </html>
publisher.html
<!DOCTYPE html> <html xmlns:th="http://www.thymeleaf.org"> <head> <meta charset="UTF-8"/> <title>Publisher System</title> </head> <body> <a th:href="@{/}">Home</a> <h2>Using Publisher-DB</h2> <ul> <li th:each="publisher : ${publishers}" th:utext="${publisher}"></li> </ul> </body> </html>
advertiser.html
<!DOCTYPE html> <html xmlns:th="http://www.thymeleaf.org"> <head> <meta charset="UTF-8"/> <title>Advertiser System</title> </head> <body> <a th:href="@{/}">Home</a> <h2>Using Advertiser-DB</h2> <ul> <li th:each="advertiser : ${advertisers}" th:utext="${advertiser}"></li> </ul> </body> </html>